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From: Keith Owens <kaos@ocs.com.au>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
cc: linux_developer@hotmail.com (Linux Kernel Developer),
        linux-kernel@vger.kernel.org
Subject: Re: Need info on the use of certain datastructures and the first C++ keyword patch for 2.2.17 
In-Reply-To: Your message of "Mon, 30 Oct 2000 18:16:44 -0000."
             <E13qJUE-00075t-00@the-village.bc.nu> 
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Date: Tue, 31 Oct 2000 08:04:57 +1100
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On Mon, 30 Oct 2000 18:16:44 +0000 (GMT), 
Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
>> 2.4 symbol generation code never sees the C++ names, 2.5 code might.
>> To detect a mismatch between kernel headers and the module version
>> file, I have to generate the checksum for the consumer of the symbol
>> (C++) as well as the generator of the symbol (C) and compare them.
>
>These are structure field names. They aren't part of a symbol and are only
>part of your checksum computation which is done on the C headers so a constant.
>
>If we were renaming variables or actual objects I'd agree. But structure names
>are fine so long as we only use C names for the module checksum computation

The checksum is done on the output from the preprocessor, not the
headers.  Changing field names via preprocessor flags gives different
checksums for structures.

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